Robert hiesch



(No Model.)

B. HIRSGH. GOMMUTATOR BRUSH.

No. 471,792. Patented Mar. 29, 1892.

UNITED STATES PATENT OFFICE.

ROBERT HIRSCH, OF MILWVAUKEE, WISCONSIN, ASSIGNOR OF ONE-HALF TO HERMAN MEMINGER, OF SAME PLACE.

COMMUTATOR-BRUSH.

SPECIFICATION forming part of Letters Patent No. 471,792, dated March 29, 1892.

Application filed October 29, 1891. Serial No. 410,165. (No model.)

T 60% whom it may concern: graphite composing the brush the wear upon Be it known that I, ROBERT HIRSGH, a citithe commutator is greatly lessened, the comzen of the United States, and a resident of mutator is kept smooth, and the contact be- 50 Milwaukee, in the county of Milwaukee, and tween the commutator and the brush renin the State of lVisconsin, have invented cerdered more perfect.

tain new and useful Improvements in Com- The necessity of cleaning and sandpaperm utator-Brushes; and I do hereby declare that ing and otherwise polishing orsmoothing the the following is a full, clear, and exact desurface of the commutator, which is neces- 5 scription thereof. sary in the use of the ordinary forms of com- My invention relates to certain new and mutator-brushes, is entirely done away with useful improvements in commutator-brushes by the employment of my improved form of for electric motors and dynamo-electric mabrush, and the surface of the commutator is chines; and it consists in the matters hereinkept bright and clean at all times. after described, and pointed out in the ap- Any metal other than copper may obvi- 15 pended claims. ously be employed to coat the surface of the In the accompanying drawings, illustrating graphite, if desired,.this metallic coating servmy invention, Figure 1. is a perspective view ing to materially strengthen the brush and of a strip or bar of graphite coated with a film to prevent the edges being chipped off in use of copper and adapted for use as a commutaand thereby adding to the durability of the 20 tor-brush. Fig. 2 is a similar View of a combrush.

mutator-brush composed of a number of such Having thus described my invention, what strips or bars united together. I claim as new, and desire to secure by Let- In said drawings, A represents the strip of ters Patent of the United States, is- 7o graphite; B, the film of copper, applied in any 1. The herein-described commutator-brush, 2 5 suitable manneras, for instance, by the eleccomprising a suitably-shaped body, composed tro-deposition of the metal upon the surface of a plurality of strips or bars, eachindeof the graphite. These strips or bars of graphpendently coated with a film or covering of ite may be made of any desired or convenient electrically-deposited metal, and the series of shape and size, and for use upon small-sized strips or bars united together by means of a 0 machines may be used singly. The brushes second film or covering of metahsubstantially for use upon large-sized machines may be as described. composed of a single block or piece of graph- 2. 'Iheherein-described commutator-brush ite, or may be composed of a plurality of comprising a suitably-shaped body composed smaller strips or bars placed side by side and of a plurality of strips or bars of graphite, 5 clamped together or otherwise united, as by each covered with a film or coating of eleca second film of electrically-deposited metal. trically-deposited metal, said strips or bars Brushes made in accordance with my inbeing united together by means of a second vention may be used in precisely the same coating of metal, substantially as described. manner as the ordinary forms of brushes, and In testimony that I claim the foregoing I 40 may be clamped or otherwise secured in the have hereunto set my hand, at Milwaukee, in

usual brush-holders. the county of Milwaukee and State of Wis- By the employment of my improved coincousin, in the presence of two witnesses. mutator-brushes formed, as described, from graphite much better results are attained ROBERT HIRSOH. 5 than can be attained by the use of the ordi- Witnesses:

nary forms of brushes from the fact that by H. G. UNDERWOOD,

the reason of the lubricating properties of the WM. KLUG. 

